Synthesis of spiro-pyrazolines: reaction of 1,3-diphenylnitrilimine with fulvenes
作者:D.N. Dhar、R. Ragunathan
DOI:10.1016/s0040-4020(01)91808-3
日期:1984.1
A one-step synthesis of a new series of spiro-pyrazolines has been accomplished by the 1,3-dipolar cycloaddition of 1,3-diphenylnitrilimine with various fulvenes (2,3,4,5-tetraphenyl fulvene (1) and its analogues (2, 3), 9-benzalfluorene (7) and its analogues (8, 9) and 6,6-diphenylfluvene (13)). With the exception of 13 all other fulvenes undergo 1,3-dipolar cycloaddition across the exocyclic double